31879723 has 2 divisors, whose sum is σ = 31879724. Its totient is φ = 31879722.

The previous prime is 31879699. The next prime is 31879733. The reversal of 31879723 is 32797813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31879723 - 2⁵ = 31879691 is a prime.

It is equal to p_1966873 and since 31879723 and 1966873 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31879733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15939861 + 15939862.

It is an arithmetic number, because the mean of its divisors is an integer number (15939862).

Almost surely, 2^31879723 is an apocalyptic number.

31879723 is a deficient number, since it is larger than the sum of its proper divisors (1).

31879723 is an equidigital number, since it uses as much as digits as its factorization.

31879723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 31879723 is about 5646.2131557354. The cubic root of 31879723 is about 317.0819446691.

The spelling of 31879723 in words is "thirty-one million, eight hundred seventy-nine thousand, seven hundred twenty-three".